create_generated_clock -name gen_clkin2 -source [get_ports clk1] -multiply_by 2 -add -master_clock clk1_port [get_ports CLKIN2] 如果生成时钟的主时钟非实际主时钟,在Tcl Console窗口将会有如下告警提示,下方还有相应的解决方法Resolution CRITICAL WARNING: [Timing 38-249] Generated clock gen_clkin2...
master_clock是时钟源的时钟名称,而且要伴随参数-add,表明一个master_clock,有多个source pin路径。 create_clock叫master时钟; create_generated_clock叫generated时钟。 总之,create_generated_clock 是用来说明generated clock与source pin的相位(边沿)关系。同时 根据source pin 找到master clock以及source pin 和master...
create_generated_clock 是用来说明generated clock与source clock的相位(边沿)关系。同时根据source clock找到master clock以及source clock 和master clock的关系, 最终会确定generated clock和master clock的相位(边沿)关系。 在genereated clock的时候一定要明确generated clock与master clock的相位关系(rise->rise or ris...
create_generated_clock -name {<constraint name>} [get_pins {<pin name>}] -source [get_pins {<opin name>}] -divide_by {1} -multiply_by {1} -add -master_clock [get_clocks {cnvr_fpga_bt_clk_switch_out}] What is the meaning of -master_clock [get_clocks {<clock name>}] in ...
create_generated_clock [-name clock_name] : 当不起名时,默认使用source第一port或pin做名字 [-add]:当同一个Port或pin需要增加两个时钟源时 port_pin_list: 此clock扇出的port pin -source master_pin : 相当于generated clock的input clock [-master_clock clock]: 当这个generated clock有多个时钟扇入时...
create_generated_clock 需要指定源时钟(master clock)的master_pin,在CTS时,默认会去balance这两个时钟(即generated clock 和 master clock),让skew尽可能小。 而且在计算generated clock的clock latency时,会把从master clock pin 到generated clock pin之间的delay也考虑在内。
create_generated_clock-name gen_clkin2-source[get_ports clk1]-multiply_by2-add-master_clock clk1_port[get_portsCLKIN2] 如果生成时钟的主时钟非实际主时钟,在Tcl Console窗口将会有如下告警提示,下方还有相应的解决方法Resolution CRITICAL WARNING: [Timing 38-249] Generated clock gen_clkin2 has no logic...
a generated clock an have another generated clock as its source, that is, one can have generated clocks of generated clocks, and so on. however, a generated clock can have only one master clock. DC\PT能够对付gated clock,但是不能对付non_unate gated clock.因为这样会产生不可预计的clock.我会...
create_generated_clock -name {clkout} -source [get_registers {clk_div:inst4|clk_div}] -master_clock {clk_div_r} [get_ports {clk_out}] 这才把clk_out设置为和sysclk关联的输出时钟。 3. 用set output delay 设置基于clkout时钟的输出dout延迟。
create_clock -name clkin -period 10 [get_ports clkin] # Option 1:master clock source is the primary clock source point with a 'divide by' value of the circuit. create_generated_clock -name clkdiv2 -source [get_ports clkin] -divide_by 2 [get_pins REGA/Q] ...